Finding the Fourth Proportional to 111.65, 153.99 and 72.27

Step by Step Solution

1. Step 1: Write the proportion equation
   111.65 : 153.99 = 72.27 : x
2. Step 2: Convert to fraction form
   111.65/153.99 = 72.27/x
3. Step 3: Cross multiply
   111.65x = 153.99 × 72.27
4. Step 4: Simplify right side
   111.65x = 11,128.86
5. Step 5: Solve for x
   x = 11,128.86/111.65
6. Step 6: Final answer
   x = 99.68